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Патент USA US3090280

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May 21, 1963
c. J. RHODES ETAL
3,090,270
MACHINES FOR CUTTING OR SHEARING SHEETS OR PLATES
Filed Dec. 1, 1958
3 Sheets-Sheet 1
11
May 21, 1963
C04. RHODES ET AL
3,090,270
MACHINES FOR CUTTING OR SHEARING SHEETS 0R PLATES
Filed Dec. 1, 1958
my!
3 Sheets-Sheet 2
May 21, 1963
c. J. RHODES ET AL
3,090,270
MACHINES FOR CUTTING OR SHEARING SHEETS OR PLATES
Filed Dec. 1, 1958
3 Sheets-Sheet 3
United States Patent Of eel
1
2
3,090,270
FIG. 2 is a front view of a practical embodiment of
MACHINES FOR CUTTING OR SHEARIN G
SHEETS 0R PLATES
3,090,270
Patented May 21, I963
the invention in the form of a hydraulically operated
_
shearing machine;
Charles Joseph Rhodes, Wake?eld, and Harry Ridgway,
Sandal, Wake?eld, England; William Stanley Rhodes
FIG. 3 is an end view of FIG. 1 from the operating
end of the machine;
and Harry Ridgway, executors of said Charles Joseph
FlG. 4 is an end view of FIG. I from the pivot end
Rhodes, deceased, assignors to Joseph Rhodes & Sons
of the machine;
Limited, Wake?eld, England, a British company
Filed Dec. 1, 1958, Ser. No. 777,383
FIG. 5 is an enlarged section on line A—A of FIG. 2;
Claims priority, application Great Britain Dec. 27, 1957
FIG. 6 is a detail plan view of the hydraulic cylinder
3 Claims. (Cl. 83-601)
10 and beam guide members; and
FIG. 7 is an enlarged section on line B—-B of FIG. 2.
This invention relates to machines for cutting or shear
ing sheets or plates (hereafter termed “plates”) having
a pivoted tool-carrying beam operated by hydraulic pres
machine has a frame structure basically com
prising, in fabricated form, it may be a casting, a bed
part 2 with an upper frame arm 3 extending parallel
thereover, the two parts being joined together at one end
by an integral upright frame part 4. This bed part is
furnished with a table 5 having a superposed work sup
port 6 to which a cutting tool 7 is fixed along its rear
edge in known manner and the upper frame arm carries
sure or other power means.
Machines of the above type are known to have a
pivoted arm or like member carrying a cutting tool posi
tioned parallel with the axis of the pivot and thus the
working stroke of a tool is in an arcuate path in relation
to the ?xed blade. In another well-known arrangement,
both for manually-operated and power-operated ma
chines, it is known to make the movable tool work in
conjunction with a fixed cutting edge in the manner of
spring returned holding-down members 8 which are hy
draulically operated by piston~cylinder units 9. The
the jaws of a crocodile and often known as “crocodile
other end of this frame structure, which hitherto has
been open between the bed part and upper arm, is closed
by a bridging upright support 10 which in effect rein
forces the upper arm
?exion during cutting
type” shears. In the latter construction, particularly for
large shearing machines, there is one main difficulty in
regard to obtaining a true cutting angle throughout a
shearing action through a substantial length of plate.
operations.
The main object of the present invention is to provide
‘an improved shearing machine having a pivoted tool 30
carrying beam which can be constructed to cut plates of
substantial length or width.
This support has a
underlaps the bed part 2.
The other basic
Accordingly there is provided a shearing machine of
the type described, including a tool-carrying beam pivoted
to a frame structure with the tool (in plan) lying longitu~
dinally at a right angle to the beam axis, the ‘tool blade
on said tool beam having a downward rake away from
the beam pivot and the nearest tool blade end spaced a
predetermined distance from the pivot, and means for
operating the beam at a point remote from the pivot, the 40
construction being such that the tool blade rake and
pivot position ensure a true cutting angle throughout the
tool blade length and progressively increasing pressure
commencing at its end furthest from the pivot, the tool
‘blade cutting edge being straight.
45
The invention includes a shearing machine having a
true substantially constant cutting angle throughout the
cutting action which starts at
tool 15.
In calculating the angle and position of the tool 15
it has been found that a convenient rake angle is three
eighths of an inch for each twelve inches of blade length
55 and the distance between the blade end 17 and the
pivot axis 13a be half the length of the blade.
over, it is considered that care must be taken regarding
the relative positioning of the pivotal pressure axis 19a,
true angle of cut throughout its length.
60
wherever the cutting intersection is in
The beam power-operating means may be hydraulic
the length of the blades during a shearing operation, a
or mechanical.
straight line can approximately ‘be drawn through the
Moreover, the improved shearing machine may incor
three points. With this arrangement, not only a true
porate auxiliary shearing means in or on the machine
framework for cutting differently-shaped sections of
metal with a movable blade carried by the aforesaid
pivoted beam.
The invention will now be more particularly described
with reference to the accompanying drawings in which:
65
cutting angle is obtained, but progressively increasing
pressure is achieved throughout the downstroke of the
tool beam by virtue of simple leverage about the fulcrum
13a to which the load progressively advances, and as
particularly illustrated at 15a in the diagrammatic view of
FIG. I.
The tool-carrying beam 11 is operated from its project
FIG. 1 is a diagrammatic rear view illustrating the 70
ing end 19 by links 20 connected to a vertically-disposed
basic feature of the invention in a simple form;
hydraulic piston 21 mounted in a cylinder 22 carried by
3,090,270
3
the aforesaid reinforcing end frame support 10 and this
piston and cylinder is controlled by a hydraulic system
which provides both the downward working stroke of the
tool and also its reverse motion. As shown, an electric
motor 23 drives a pump 24 drawing oil from the tank 25 (A
through pipe 26 and forcing it through pipe 27 through
horizontal table surface upon which the work to be cut
is placed, a tool beam above said table surface pivotally
connected at one end to said frame adjacent one side of
said horizontal table surface, a movable cutter blade
secured to said tool beam at right angles to the pivot axis
thereof, a stationary cutter blade secured to said table sur
face substantially coplanar therewith at right angles to
the tool beam pivot axis for shearing cooperation with
said movable cutter blade, the cutting edge of said movable
cutter blade having a predetermined downward inclination
It]
?xed on the latter shaft carry a treadle member 37. The
in a direction away from the beam pivot so that during a
control valve 29 is connected by pipe 38 through valve 39
cutting operation the end of the movable cutter blade re
to the top of cylinder 22 and by pipe 40 through valve 41
mote from the tool beam pivot axis will cooperate with
to the lower part of the cylinder. This valve 41 provides
said stationary blade before the end of said movable cutter
exhaust restriction from the cylinder 22 and free ?ow
blade which is adjacent said pivot axis, and means con
pressure relief valve 28 to the control valve 29. The lat
ter is operated by levers 30, rod 31, lever 32, link rod
33 and lever 34 ?xed on the pivot shaft 35. Levers 36
A pipe 42 is connected from valve 39 to the ,4 Cir nected to said tool beam at the other end thereof remote
from said pivot axis for pivoting said tool beam toward
said table surface, said movable cutter blade being secured
to said tool beam in such manner that the cutting intersec
tion between said stationary cutter blade and said movable
cutter blade lies always in a straight line which approxi
pipe 38, immediately following admission through pipe
mately can be drawn through the tool beam pivot axis and
42 to the holding-down units, to give the tool beam 11 a
the point of connection of the means for pivoting said tool
down stroke and when the treadle is released the oil will
beam about its pivot axis toward said table surface, where
pass through pipe 40 to reverse the beam stroke. The
by said movable cutter blade has a substantially true angle
forward end of the tool-carrying ‘beam works between
of cut throughout its length and a progressively increasing
guide means of which one member 44, adjustable for set
shearing action starting from its end furthest from said
ting and wear, is provided on the back of said end rein
pivot axis.
forcing upright 10, and the other member 45 secured to
2. A shearing machine comprising a frame having a
the back of the bed 2 and arm 3.
horizontal
table surface upon which the work to be cut
As an additional feature, this shearing machine is made
is placed, a tool beam above said table surface pivotally
more universal by the provision of a so-called “cropping”
connected at one end to said frame adjacent one side of
unit which is built into the aforesaid integral end part 4
said horizontal table surface, a stationary cutter blade
of the frame structure adjacent the beam pivot and above
secured to said table surface substantially coplanar there
the table 5. This unit is of generally known form com
with at right angles to the tool beam pivot axis, hydraulic
prising a pair of blades 46, 47 of which blade 46 is ?xed
means secured to said frame adjacent the other end of said
in an opening 48 in the frame structure 4 and the other
tool beam remote from said pivot axis and connected to
blade 47 ?xed in an opening 49 in the beam 11. Both
said tool beam to pivot the same toward said table surface,
blades have shaped openings 50 therein adapted to accept
and a movable cutter blade secured to said tool beam in
different cross-sectional shapes of bars or other metal
members which may be, say of circular, rectangular, octa 4.0 such manner that the cutting intersection between said
stationary cutter blade and said movable cutter blade lies
gonal, angle, T, or other section. The bars or other
thereinto.
holding-down cylinders 9 and the valve 29 exhausts
through pipe 43 to the tank 25. This valve 39 is used
to ensure hydraulic pressure to cylinders 9 before opera
tion of piston 21. Thus when the treadle is depressed
oil under pressure is admitted to the cylinder 22 through
members need simply be thrust through the two blades
46, 47 and as the beam 11 pivots the cropping blade 47
carried thereby will shear through the said bar or member.
Here again, the frame structure may carry holding-down
means for the bars or members.
As shown a pair of up
right pillars 51 are secured to the table 5 and have a
slidable bridge 52 mounted thereon. The latter has a
always approximately in the plane which passes both
through the pivot axis of said tool beam and through the
pivot of connection of said hydraulic means to said tool
beam, said movable tool blade being normal to the pivot
axis of said tool beam for shearing cooperation with said
stationary cutter blade, the cutting edge of said movable
cutter blade having a predetermined downward inclination
in a direction away from the beam pivot so that during a
in engagement with a series of holes or notches in the 50 cutting operation the end of the movable cutter blade re
mote from the tool beam pivot axis will cooperate with said
pillars so that the bridge can be released and slid down
stationary blade before the end of said movable cutter
into proximity with a member to be cut and then the
blade which is adjacent said pivot axis, whereby said
handled screw 54 can be tightened down onto the member.
movable cutter blade has a substantially true angle of out
With the above arrangement, due to the leverage ob
tained, plates of greater thickness than the normal maxi 55 throughout its length and a progressively increasing shear
ing action starting from its end furthest from said pivot
mum can be cut by the tool so long as such plates are
pair of displaceable handles 53 having their inner ends
of less width or length than the overall length of the tool
and by inserting them nearer ‘to the pivotal axis. By this
it is meant that should a tool he, say, eight feet in length
axis.
3. Apparatus as de?ned in claim 2 wherein the downward
rake of the movable cutter blade is approximately three
and designed to cut plates of quarter-inch thickness, other 60 eighths of an inch for each twelve inches of blade length,
plates progressively of greater thickness may be cut up to
the edge of said movable cutter blade adjacent said tool
a given maximum by using a shorter length of the blade
beam pivot axis being spaced from said pivot axis a dis
nearer the pivotal axis, i.e. say three-quarter inch plates
tance approximatly equeal to half the length of said mov
may be out towards the end 17 of the tool and, say, half
65 able cutter blade.
inch plates from about the middle of the tool.
In a modi?ed arrangement the piston 21 and cylinder
References Citerl in the file of this patent
22 may be used to produce merely the beam working
UNITED STATES PATENTS
stroke with other means to provide a tool return. On
1,322,099
Fegley ______________ __. Nov. 18, 1919
the other hand, the tool-carrying beam 11 can readily be
Hosch _______________ __ May 8, 1923
operated by some other power means, such as a crank and 70 1,454,285
crankshaft.
What we claim is:
1. A shearing machine comprising a frame having a
1,729,076
2,144,540
Laycock _____________ __ Sept. 24, 1929
Lindgren _____________ __ Jan. 17, 1939
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